[dead]

This is a restatement of 1990s-vintage science. It almost can't (it very probably isn't, but it's close to mathematically refuted) be true that simple twin study designs are correct about behavioral traits: parents mate assortatively, with large correlations specifically on education, so it's quite unlikely that fraternal twins have 50% shared genes for behavioral traits. Don't see the term "assortative mating" in an article like this? It's trying to sell you something.

(There are other broken assumptions in classic twin studies as well; this is just an easy one to describe).

This is the reason we have modern modalities like RDR (invented by a hereditarian!) and sibling regression.

Noah Carl's Wikipedia page is some interesting background (the author of the Aporia piece you provided). Enjoy!